Photosensitive Polyamic Acid Diazirine Compositions
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Solution Overview
Problem
Conventional polyimide and polyamic acid compositions used in microelectronics and optoelectronics suffer from poor thermo-mechanical properties, require high cure temperatures, and contain toxic volatile crosslinkers, posing environmental concerns and limitations in applications.
Innovation Solution
A photosensitive composition combining polyamic acid or end-capped polyamic acid with diazirines, which provides improved thermo-mechanical properties and can be cured at lower temperatures without acrylate crosslinkers, using dianhydrides and diamines with suitable end-capping agents and diazirines for enhanced solubility and photo-imaging capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polyimide and polyamic acid compositions are used, then positive tone image forming is achieved, but thermo-mechanical properties deteriorate and high cure temperatures are required
Solution Approach 1:
The patent changes the chemical structure parameters of the polyamic acid by incorporating specific diamine units with flexible spacers and controlling the polyamic acid structure to enable low-temperature curing while maintaining positive tone image forming capability. The composition achieves effective curing at temperatures below 150°C through optimized molecular structure design.
Solution Approach 2:
The patent creates a composite system by combining polyamic acid with specific photoinitiators and controlling the interaction between these components to achieve both positive tone imaging and low-temperature curing properties that neither component could achieve alone.
2Stability of the object's composition
If conventional polyimide compositions are used, then structural integrity is maintained, but environmental harm increases due to toxic volatile crosslinkers
Solution Approach 1:
The patent removes toxic volatile crosslinkers from the composition entirely, replacing them with alternative curing mechanisms that use photoinitiators to achieve crosslinking without harmful emissions, thereby eliminating environmental harm while maintaining structural integrity.
Solution Approach 2:
The patent converts the harmful curing process into a beneficial one by using light-initiated polymerization that produces no toxic emissions, transforming an environmentally harmful process into an environmentally friendly one while achieving the same structural consolidation.
3Ease of manufacture
If polyamic acid compositions are used, then solubility in common solvents is achieved, but photo-imaging capabilities deteriorate
Solution Approach 1:
The patent introduces photoinitiators as intermediary substances that enable photo-imaging capability in the polyamic acid composition. These photoinitiators absorb light energy and trigger polymerization reactions, acting as a bridge between the soluble polyamic acid and the desired photo-imaging function.
Solution Approach 2:
The patent modifies the optical parameters of the composition by adding photoinitiators with specific absorption characteristics, enabling the composition to respond to light exposure and achieve photo-imaging capability without compromising its solubility properties.
4Strength
If acrylate crosslinkers are used in polyimide compositions, then crosslinking density is improved, but environmental friendliness deteriorates due to volatile toxic components
Solution Approach 1:
The patent extracts and removes acrylate crosslinkers from the composition, replacing them with alternative crosslinking mechanisms that use photoinitiators to achieve crosslinking without volatile toxic components, thereby eliminating environmental harm while maintaining crosslinking density.
Solution Approach 2:
The patent substitutes the chemical crosslinking mechanism (acrylate-based) with a light-initiated crosslinking mechanism, replacing a harmful chemical process with a cleaner optical-chemical process that achieves the same crosslinking function without toxic emissions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition achieves superior thermo-mechanical properties, low cure temperatures, and environmental friendliness, with enhanced photo-imaging and adhesion properties, suitable for various microelectronic and optoelectronic applications.
Implementation Method 1
conventional polyimide and/or polyamic acid compositions may contain fugitive volatile acrylic based crosslinkers
Implementation Method 2
such compositions exhibit improved thermal, mechanical and opto-electronic properties
Data Source
AI summary
Embodiments in accordance with the present invention encompass a composition comprising a polyamic acid or an end capped polyamic acid and a diazirine, which are useful as photosensitive compositions for forming films that can be patterned to create structures for microelectronic devices, microelectronic packaging, microelectromechanical systems, optoelectronic devices and displays. In some embodiments the compositions of this invention are shown to feature excellent hitherto unachievable mechanical properties. The negative images formed therefrom exhibit improved thermo-mechanical properties, among other property enhancements.